Many regional wine shows are held in September. In some cases only local wines are judges and in others entries are open to all the wines of that stste or even Australia.
The strong tradition of wine shows and awards allows winemakers to compare thier wines to those of their peers, and the awards given provide rough guidance to consumers as what the quality of the wines are.
Often the judging is followed by a public tasting or a dinner and sometimes the wine show is part of a larger regional festival. These events are well worth attending as they give participants a deeper knowledge of the local terroir.
If you can't make it you can always check out the results on the websites of the organising bodies
Some wine shows you might like to find out about